Mining drill



Aug. 6, 1935.

w cook MINING DRILL Original Filed June 15, 1932 Patented Aug. 6, 1935 MINING DRILL Walter Cook, Benton, Ill., assignor to Central Mine Equipment (20., St. Louis, Mo., a corporatlon of Missouri Application June 15, 1932, Serial No. 617,299

Renewed February 12, 1934 19 Claims. (01. 255-60) This invention relates to mining drills, and

has special reference to mining drills of the auger- An object of the invention isto provide im- 5 proved equipment for a mining-drill of the auger type whereby series of bits may be detachably secured to the end of the auger in a novel cooperative relationship, the bits comprising each series also being arranged and mounted in a novel rela- 10 tionship with respect to each other, so that a satisfactory and improved boring or.drilling eflfect is obtained when the drill is operated.

' Another object of the invention is to provide an improved wedge fastener of novel construction whereby the bits may be detachably secured to the end of the augerin the novel relationship indicated and hereinafter-more particularly described.

Another object of the invention is to provide an improved mining drill embodying all of the novel and advantageous features, and obtaining all of the improved advantageous results, herein disclosed or otherwise made apparent from the following description, reference being made to the annexed drawing, in which- I Fig. 1 is an end elevation of the auger of a mining drill embodying and having in connection therewith my present invention.

Fig. 2 is a side elevation, a part of the auger at right angles asin Fig. 7 is a perspective view of the, bit wedge illustrated in Fig. 5.

Fig. 8 is a perspective view of one of the bits.

Fig. 9 is a perspective view of a bit having a cutting edge at each end.

Fig. 10 is a side elevation of a wedge and one of the cutting bits associated therewith-showing their engaging curved walls. g a i Fig. 11 is an elevation of the opposite side of the wedge ,and associatedcutting bit showing their engaging curved walls.

The detachable endmember I of the auger is formed. with a socket 2 designed and adapted to 'receive an extended portion ofthe main part of the auger and has a keyhole 3 adapted to receive being broken away to show more clearly the ara key to secure the part I rigidly on the extended portion of the main part of the auger.

The forward end of the detachable end member I is formed with two sockets 4, the outer side walls 5 being. in substantially spiral continuation of the inclined walls 6 of the ribs 1.

The two opposite walls 8 of each socket 4 converge rearwardly from the front end of the member I; so that the rear portions'ofthese sockets 4 .are' of less width than the forward portions there-a of. The sockets are open at both ends, so that the wedge fasteners hereinafter described extend entirely through the sockets.

The wedge shown in Figs. 1 to 4, inclusive, and in Fig. 6 comprises a tapered body having in one corner of its forward end a notch 9 and in the diagonally opposite corner a notch l0, thus providing a wall I I and a wall l2 integrally connected by a portion I3 and leaving the opposite end l4 of the bit wedge solid to provide 'a shoul der l5 at the end of each of these notches. Accordingly, the structure comprising the walls II and I2 and the connecting portion l3 may be described as of approximate Z -shape. The corner l6 of the wall l2 opposite the notch I0 is rounded in order to be received within a correspondingly rounded portion of the socket 4. I

The side walls I! of the sockets 4 are provided with notches l8 which are in substantial continuatlonof the notches 9 and I0, respectively, when the bit wedge is mountedin the'socket.

The bits may be of duplicate construction. Each bit comprises an elongated body l9 that is substantially rectangular in cross section and curves forwardly, having a bevel cut 20 on its outer end inclining from intersection with the rear wall to intersection with the front wall of the body I 9 to. provide a relatively sharp cutting edge 2 I. These bits fill the notches 9 and l 0 and abut against the walls l5 and fill the notches l8.

In attaching the bits to the auger, a bit is placed in each of the notches 9 andl 0 of each bit wedge and the assembled bits and wedge are then driven into one of the sockets 4. The wedge tapers in conformity with the taper of the socket 4 in which the wedge is mounted. When a wedge and the bits assembled in connection therewith are driven into either socket,- the bits are clamped and wedged in the notches 9 and I0 and in the notches I 8, a rigid wedging connection being thus secured and maintained: The ends of the bits are covered and enclosed within the sockets into which the bits extend, but the wedges extend beyond the sockets, as clearly shown in Figs. 2 and 3, so that the rear ends H of the wedges may be struck with a hammer or other tool anddriven from the sockets for any desired purpose.

The walls of the notches 9 and ill form curved surfaces on the walls II and I2 in conformity with the curvature of the bit bodies i 9. The outer bits, which are mounted in the notches l0 closest to the periphery of the auger, are preferably of somewhat less length than the remaining bits which are closet to the axis of the auger. The sockets 4 incline outwardly and forwardly toward the periphery of the auger, sothat the bits are maintained and supported in an inclined relationship with their rear ends nearer the axis of the auger than their outer ends. In fact, the outer ends of the outer bits extend substantially beyond the periphery'of the auger, so that the bits will cut and drill and bore a hole of substantially larger diameter than the diameter of the auger body. The bits that are closest to the central axis of theauger extend forwardly beyond the lateral bits and cut and drill in advance of the ends of the lateral bits. The outer bits, which is to say the bits that are mounted in the notches,

ill, travelin advance of the inner bits when the auger is rotated.

Thus, my invention comprises an embodiment of means for supporting and wedging and clampingseries of bits in detachable engagement with the forward end of an auger in a relationship in which the bits of each series are arranged to travel one in advance of the other when the auger is rotated. I consider this angular type of 'wedge generically new, and the novel functions that it performs ofoifsetting the bits and strengthening the outer portion of the rear wall ll of the socket are highly advantageous. Further, the device supports and holds the bits in an outwardly inclined and forwardly curving relationship, so that the central bits, which are the bits closest to the axis of the auger, cut'in advance of the outer bits, which are closest to the periphery of the auger; and the outer bits are inclined to such an extent that their cutting points extend beyond the periphery of the auger and will cut or bore or drill a hole of larger diameter than the diameter of the auger.

In Figs. 5 and 7, the bit wedge is of reverse construction, the inner notch 22 being in the front side and the outer notch 23.being in the rear side of the wedgebody, thus forming an inner wall 2t and an offset outer wall 25 united by an integral connection 26.- The inner. end portion 21 of the body is solid and is without notches, the end walls 28 of the notches forming .abutments against which the ends of the bits engage.

A bit 29 is mounted in each notch 22 and in a corresponding notch 30 in the socket wall 3 l, and a bit 32 is mounted in each notch 23 and in a corresponding notch 33 in the socket wall 34.

These bits 29 and 32 are constructed and formed in the same manner as the bits l9, the notches' 30 and 33 being in the socket walls opposite from the notches l8, so that the outer bits 32 are offset rearwardly from the inner bits 29, leaving the inner bits 29 traveling even with or possibly in advance of the. outer bits 32 when the drill is rotated. The sockets in which these modified wedge members are mounted are otherwise the same as the sockets 4, the wedge members protruding beyond the sockets, so that the rear ends of the wedge members may be struck with a hammer or other tool and the wedge members driven from the sockets for any desired purpose.

The bit shown in Fig. 9 comprises an elongated body3i that is, substantially rectangular in crow 35 in the notches 9 and I0 or'in the notches 22 and 23. When the protruding end of the bit becomes worn, the wedge may be driven from the socket and the bits applied in reverse position, substituting the cutting edge 31 at the outer end of the bit for the end 36-, or vice versa.

Obviously this invention may be varied in other particulars and may be easily designed to include any desired number of bits, and I do not restrict myself to the specific forms and configurations shown. I contemplate such variations as may 4 adapt the invention to its intended purposes, and

do not restrict myself in any unessential particulars. What I claim and desire to secure by Letters Patent is:

1. In a mining drill having sockets in its forward end, a wedge removably seated in each of said sockets and having notches in diagonally opposite corners, and a bit mounted in each of said notches and engaged against the wall of the socket and thereby locked in a relationship in which certain. of said bits are in advance of the others when the drill rotates.

2. In a mining drill, walls forming sockets in its forward end and having notches in certain of said walls, a wedge member mounted in each of said sockets and having diagonally opposite notches corresponding to said first named notches,

and bits mounted rigidly in the notches in' said wedge members and said walls.

3. In a mining drill having sockets in its forward end, an approximately Z shaped wedge mounted in each of said sockets, and cutting bits mounted on opposite sides of said wedges in said sockets and clamped against the walls of said sockets.

4. A drill bit holding tool having a forward end of smaller diameter than the remaining portion, sockets in the forward end of said tool, approximately Z-shaped clamping wedges mounted in said sockets and having notches in the opposite sides thereof facing the walls of said sockets, and bits mounted in said notches on opposite sides of said wedge members and clamped rigidly against the walls of said sockets.

5. In a'mining drill having sockets in its for ward end, wedgeblocks mounted in said sockets and having notches in opposite sides thereof provide'd with longitudinally curved walls, and longitudinally curved cutting bits mountedin said notches in said wedge blocks and'matching the curvature of said walls of said notches and being clamped between said wedge members and the walls of said sockets.

6. In a mining drill having forwardly diverging sockets in its forward end, diverging cutting bits extending into each of said sockets, and an angular clamping wedge clamped rigidly in each of said sockets and extending on adjacent and also on opposite sides of said bits and clamping said bits in diverging relation in said sockets.

7; In a mining drill having forwardly diverging sockets in its forward end, clamping wedges rigid in said sockets and having notches in its opposite sides, and cutting bits clamped in forwardly diverging relation in said sockets and in said notches on opposite sides of said clamping wedges.

ing sockets in its forward end, a number of forwardly diverging cutting bits extending into each of said sockets, and angular clamping wedges rigid in said sockets and engaging front and rear sides of respective cutting bits mounted in the respective sockets.

9. In a mining drill having forwardly. diverging sockets in its forward end, a wedge removably seated in each of said sockets and having forwardly diverging notches in diagonally opposite corners, and forwardly diverging bits mounted in said notches and engaged against the walls of the socket and thereby locked' in a relationship in which certain of said bits diverge forwardly and are in advance of the others when the drill rotates.

10. In a mining drill, walls forming forwardly.

diverging sockets in its forward end and having notches in certain of said walls, a wedge mounted'in each of said sockets and having forwardly diverging diagonally opposite notches corresponding to said first named notches, and forwardly diverging bits mounted rigidly in the notches in said wedge members and said walls.

11. In a mining drill having forwardly diverging sockets in its forward end, an approximately Z-shaped wedge mounted ineach of said sockets, and cutting bits mounted on opposite sides of said wedges in said sockets and clamped against the walls of said sockets in forwardly diverging relationship.

. 12. A drill bit holding tool having a forward end of smaller diameter than the remaining portion, forwardly diverging sockets in the forward raisin? 16. In a mining drill having a tapered socket .in its forward end, a wedge removably mounted in said socket and having notches in diagonally opposite portions thereof, and cutting bits extending into said socket and in said notches and thereby rigidly secured in connection with said drill in a relationship in which said bits diverge forwardly and have their forward ends spaced distance in excess of the diameter of said the socket and alsohaving an elongated notch in one corner extending from its'front end to-' ward and terminating short of its rear end, and

a bit mounted in said socket in front of said wedge and seating in and extending the full length of -said notch and against the side of the forwardly braced thereby beyond socket.

.18. In a mining drill having a taperedsocket in its forward end, a wedge of greater lengththan said socket removably mounted therein and having its forward end extending beyond the forward end of saidsocket and having its rear end the forward end of said projecting end portion of said wedge and being extending rearwardly beyond said socket in p0- sition to be struck to drive the wedge forwardly out of the socket and also having an elongated notch in one corner extending from its front end toward and terminating short of its rear end,

a bit mounted in said socket in front of said wedge and seating in and extending the full length of said notch and against the side of the forwardly projecting end portion 'ofsaid wedge and being .bracedtherebybeyondtheforwardendofsaid socket, and an additional bit extending into said socket atthe rearof said-wedge and being nearer theaxisofthedrillthansaidi'irstnamedbit.v

'19.Inaminingdrill-havingataperedsocket initsforwardend,awedgeofgreaterlength..-

soeketinposition tobestrucktodrive the wedge for'wardly'from thesocketandaisohaving an elongatednotchinoneoornerextendingfromits front end toward and terminating short of its rear end, and -aforwar'diy curved bit mounted insaidsocketinfrontofsaidwedgeinandu tendingthefulilengthofsaidnotchandbeing braoedbysaid'wedge beyondtheforwardendof --saidsocket,saidbithavingabeveledwaliextend- 

